KR100332499B1 - Roller drive mechanism - Google Patents

Abstract

In the roller drive transmission mechanism which separates and conveys each sheet from the top sheet of paper in the stacked state, when there is no paper, the load is applied to the gear mechanism due to the impact when the ejection roller is pressed against the mounting surface. Avoid working

The separation roller 12 and the carrying out roller 6 which support the shaft of the rotating arm 2 are drive-transmitted by a gear transmission mechanism, and the roller bushing 5 and the gear cylinder which are integral with the carrying roller 6 are carried out. The spring 7 is wound around (4) to form a torque limiter which drives the spring 7 from the gear cylinder 4 to the carrying-out roller 6 in the relaxed direction.

Description

Roller drive transmission mechanism

The present invention relates to a drive transmission mechanism of a roller by connecting a transport roller and a separation roller to a gear transmission mechanism for separating and conveying the loaded paper one by one from the top, for example, a multifunction machine having both functions of a copier, a facsimile device, a copy and a facsimile machine. And an image recording apparatus such as a printer or the like, and to a paper feed mechanism for feeding a document or a recording sheet.

Background Art [0002] Conventionally, roller mechanisms for feeding documents and recording paper of an image recording apparatus as described above, for separating and conveying stacked paper one by one from the uppermost layer, are widely known. This roller drive transmission mechanism connects the ejection roller which presses the uppermost surface of the loaded paper from the upper side, and the separation roller which conveys the paper conveyed to the downstream side by the compression rotation of the ejection roller by gear transmission mechanism. Rotate together with the separation roller.

However, as in the prior art, when the takeout roller rotates simultaneously with the separation roller, when there is no paper to be fed, the takeout roller rotates while pressing the tray for loading the document or recording paper together with the downstream separation roller, and the takeout roller and its downstream separation roller. There was a problem that the gear transmission mechanism was damaged due to the load applied.

BRIEF DESCRIPTION OF THE DRAWINGS The top view of the roller mechanism used for carrying out the paper which concerns on this invention.

2 is a perspective view of the mechanism of FIG. 1;

Fig. 3 is a schematic view of the side showing the rotational direction of the gear body transmission mechanism.

4 is a side sectional view showing a specific configuration of the intermediate electric shaft 8 and the intermediate gear 9;

Fig. 5 is a side schematic view showing a state in which paper is taken out by a paper take-out roller mechanism in a state where paper is loaded;

6 is a schematic side view of a state in which only one sheet of paper is present.

Fig. 7 is a side view of the document feeding mechanism to which the paper carrying roller mechanism of the present invention is applied.

FIG. 8 is a schematic overall configuration diagram of an image processing apparatus having a document feeding mechanism shown in FIG.

-Explanation of symbols for the main parts of the drawing-

1 ------------------------------- Carriage Drive Shaft,

2 ------------------------------- Rotating Arm,

3 ------------------------------- export roller shaft,

4 ------------------------------- gear cylinder,

4a ------------------------------ gears,

5 ------------------------------- Roller Bushing,

6 ------------------------------- export roller,

7 ------------------------------- Spring,

8 ------------------------------- intermediate motor shaft,

8a ------------------------------ spring,

8b ------------------------------ E ring,

9 ------------------------------- Intermediate gear,

10 ------------------------------ gear cylinder,

10a ----------------------------- gear,

11 ------------------------------ Roller Bushing,

12 ------------------------------ Separation roller,

13 ------------------------------ Roller Bushing,

14 ------------------------------ spring,

15 ------------------------------ spring,

16 ------------------------------ Retard roller,

17 ------------------------------ Manuscript Plate,

A ------------------------------- Document Feeder,

In view of such a problem, the present invention uses the following means. That is, as a drive transmission mechanism of the roller which rotates by obtaining a driving force, it comprises the drive transmission mechanism of the roller which installs the spring type drive transmission member by which a driving force is transmitted between the roller and the drive side in the loosening direction which a spring loosens. Here, the spring relaxation direction refers to a direction in which the inner diameter of the spring is increased by rotating in a release direction without the spring being wound.

Further, in the above-mentioned roller drive transmission mechanism, the roller is an unloading roller for carrying out paper while pressing the uppermost surface of the loaded paper from the upper side, and the electric mechanism rotates in the same direction as the conveying rotation of the separating roller provided below the roller. It constitutes the drive transmission mechanism of the roller connected to. Then, the drive transmission mechanism of the roller is applied to the document feeding mechanism.

Embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 1 is a plan view of the roller mechanism for paper transport according to the present invention, Figure 2 is a perspective view of the roller mechanism of Figure 1, Figure 3 is a side view showing the rotation direction of the gear transmission mechanism, Figure 4 is an intermediate transmission shaft (8) and Side cross-sectional view showing the specific configuration of the intermediate gear (9), Figure 5 is a side view showing the state of taking out the paper to the paper removal roller mechanism in the state of paper loaded, Figure 6 is a state in which only one last sheet of paper 7 is a side view of the document feeding mechanism to which the paper ejecting roller mechanism of the present invention is applied, and FIG. 8 is an overall schematic configuration diagram of an image processing apparatus including the document feeding mechanism shown in FIG.

First, in Fig. 1 to Fig. 4, the configuration of the roller ejecting roller mechanism using the roller drive transmission mechanism according to the present invention will be described. The conveying drive shaft 1 is loosely inserted into the pivoting arm 2, and the unloading roller shaft 3 and the intermediate transmission shaft 8 are fixed to the pivoting arm 2 with screws. The gear cylinder 4 and the roller bushing 5 adjacent thereto are rotatably inserted into the unloading roller shaft 3. The roller bushing (5) is inserted and fixed with a carrying roller (6) such as rubber, and the gear cylinder (4) and the roller bushing (between the gear (4a) formed in the gear cylinder 4 and the inner end of the take-out roller (6) On the outer surface of 5), a spring 7 is attached so that the rotational direction of the gear 4a coincides with the spring relaxation direction.

As shown in Fig. 4, the intermediate gear 9 is inserted into the intermediate transmission shaft 8 so as to be rotatable and engaged with the gear 4a. Moreover, the spring 8a is attached to the intermediate | middle transmission shaft 8 between the intermediate gear 9 and the rotational arm 2. As shown in FIG. The spring 8a may be mounted between the intermediate gear 9 and the E ring 8b. Moreover, the gear cylinder 10 is rotatably mounted to the conveyance drive shaft 1, and the intermediate gear 9 meshes with the gear 10a formed in the gear cylinder 10. As shown in FIG. The rotation direction of the gear 10a, the intermediate gear 9, and the gear 4a by rotation of the conveyance drive shaft 1 is the same as FIG. 3, and the rotation direction is the same as the gear 10a, the gear 4a.

The roller bushing 11 is rotatably mounted to the gear cylinder 10, and the separating roller 12 such as rubber is attached to the roller bushing 11. The outer end of the gear cylinder 10 extends outward from the outer end of the roller bushing 11, and is fixed to the conveying drive shaft 1 outside the outer end of the gear cylinder 10 with a fixing pin 13a. The fixing member 13 is mounted. Then, the outer surface of the roller bushing 11, the gear cylinder 10, and the fixing member 13 protruding from the transport drive shaft 1 to the separation roller 12 outside, the spring 14 in the rotation direction of the transport drive shaft (1). Mount the spring 14 so that the winding direction of the

When the conveying drive shaft 1 rotates in the paper conveying direction, the fixing member 13 rotates simultaneously with the conveying driving shaft 1, and is wound in the direction in which the spring 14 is tightened, and the fixing member 13 and the gear cylinder ( 10) and the roller bushing 11 is pressed like one body, and rotates the separation roller 12 integrally with the conveying drive shaft (1). On the other hand, when the rotational force is applied to the gear 10a in the reverse direction of the conveying rotation direction, the spring 14 is released in the relaxed direction, and the transmission from the conveying drive shaft 1 to the separating roller 12 is cut off and acts like a clutch.

When the separation roller 12 rotates in the paper conveying direction by driving the conveying drive shaft 1, the gear 10a rotates, and the gear 4a and the gear cylinder 4 move through the intermediate gear 9 to the gear ( Rotate in the same direction as 10a). This rotation direction is a direction which relaxes the spring 7. However, since the transport roller 6 is in contact with the paper and the load resistance is small, the roller bushing 5 and the transport roller 6 together with the rotation of the gear cylinder 4 by the winding force of the spring 7 itself. ) Rotates. Then, when the take-out roller 6 is overloaded, that is, all of the paper is taken out and the take-out roller 6 comes into contact with the surface of the paper loading tray (document plate 17 described later). Since a large force is applied in the direction to relax the spring 7, drive transmission between the gear cylinder 4 and the roller bushing 5 is interrupted. In this way, when a predetermined load or more acts, drive transmission is stopped, and a torque limiter for transmitting rotational driving force to the carrying-out roller 6 with a constant torque is formed.

In this way, when there is no carry-out paper and the take-out roller 6 comes into contact with the tray surface and is overloaded, the drive transmission between the gear cylinder 4 and the roller bushing 5 is interrupted to avoid applying excessive force to the gear drive mechanism. And gear breakage. In addition, the spring (7) is provided to drive the drive in the relaxation direction, so that the spring (7) is not inserted between the roller bushing (5) and the gear cylinder (4) during the drive rotation of the separation roller (12) and the carrying out roller (6). Therefore, the malfunction caused by this is also eliminated.

In addition, as shown in FIG. 2, a spring 15 is provided on the pivoting arm 2, and the pivoting arm 2 is urged to rotate upward about the conveying drive shaft 1. The rotational force of the conveying drive shaft 1 acts as a force for rotating the pivoting arm 2 downward against the spring 15 (to be described later), and the paper conveys downstream from the separating roller 12 (Fig. 7), or the paper is clogged and the load acts on the conveyance rotation of the conveying drive shaft 1, the spring 14 is relaxed, by the tension of the spring 15, the self-loading roller (6) ) Rotates upward, making it easier to convey the paper to the downstream side or to easily take out the jammed paper.

The carrying out of the paper by the roller mechanism shown in Figs. 1 to 4 having the above configuration will be described with reference to Figs. First, as shown in FIG. 5, when the conveyance drive shaft 1 rotates while the paper P is loaded on the document placement plate 17, the spring 14 is wound in the fastening direction by the rotational driving force, and the gear 10a rotates simultaneously. The intermediate gear 9 meshed with the gear 10a tries to rotate with the gear 10a, but rotation is inhibited by the force of the spring 8a, and the intermediate gear 9 and the intermediate transmission shaft 8 are like one body. As a result, the rotational arm 2 rotates downward integrally with the intermediate transmission shaft 8 by the rotation of the gear 10a. As a result, the carry-out roller 6 also rotates downward to come into contact with the paper. In this state, since further downward rotation of the pivoting arm 2 is prevented, since the transmission force from the gear 10a to the intermediate gear 9 becomes larger than the frictional force of the spring 8a, the intermediate transmission shaft 8 The intermediate gear 9 rotates with respect to, and when the rotational force is transmitted to the gear 4a, the take-out roller 12 rotates.

Therefore, when the transport roller 12 comes into contact with the top surface of the paper P, the separation roller 12 and the deceleration roller 16 in contact with the transport drive shaft 1 rotate along with the rotational drive of the transport drive shaft 1, By carrying out gear transmission of the gear 10a, the intermediate gear 9, and the gear 4a, the removal roller 6 is also torque-controlled by the torque limiter and rotates in the same rotational direction as the separation roller 12. ) One sheet is taken out between the separation roller 12 and the reduction roller 16 on the downstream side.

When the paper of the uppermost layer is taken out, the rotational force of the conveying drive shaft 1 influences the rotation of the pivoting arm 2 by the load force of the intermediate transmission shaft 8, so that the unloading roller 12 is Contact Then, by the rotational drive of the conveying drive shaft 1, the separation roller 12 and the carrying out roller 6 rotate to carry out the paper.

And, as shown in Figure 6, when only the last one is left, it is taken out, the export roller 6 is in contact with the top surface of the document placement plate 17. Since the document mounting plate 17 does not follow the unloading roller 6 rotating in the same direction as the separating roller 12, the force opposite to the conveying direction is applied to the unloading roller 6. Thus, the spring 7 is released from its wound state to a relaxed state to buffer this load. Soon, the spring 7 is relaxed, and the rotation of the carry-out roller 6 and the gear 4a stops. For this reason, the rotation of the gear 10a through the intermediate gear 9 also stops, but the spring 14 is in a relaxed state, and the separation roller 12 is in a free state and does not rotate with the conveyance drive shaft 1. . In this way, even when all the paper is taken out and the transfer roller 6 is brought into direct contact with the document mounting plate 17, an excessive load is not applied to the gear transmission mechanism of the gears 4a, 9, 10a, and the like. Can be avoided.

FIG. 7 shows an embodiment in which the paper carrying gear mechanism is applied to the document feeding mechanism A of the image processing apparatus shown in FIG. Referring to the schematic configuration of the image processing apparatus of FIG. 8, the document feed tray T which is continuous to the document placing plate 17 at the upper portion, and the parallel discharge document placement tray T 'at the lower portion thereof are the document feed mechanism ( It is installed inclined on the side of A), and a stop document placing surface B is provided below the discharge document placing tray T '. Below the stationary document placement surface B, the scanning reading portion C of the optical reading device is provided. Underneath, a recording sheet conveying mechanism is provided, which is a recording section D for recording on the recording sheet based on the original reading information of the reading section C or based on the transmitted information.

Originals placed in the original loading tray (T) in a stacked state are separated one by one and conveyed by the document feeding mechanism (A), and are read by a reading device arranged in a stationary state by the reading unit (C) during the conveyance. Is done. On the other hand, in the stationary document placement surface B, the document is placed in a stationary state such as a book, and the reading unit C scans the reading device to read.

In this way, the document feeding mechanism A is a conveying mechanism for reading the document by reading the document to a stationary reading device. This configuration will be described with reference to FIG. 7. The conveyance drive motor M is provided in the side plate 18, and the separation roller 12, the conveyance rollers 19 * 21 * 23, and the discharge roller 25 are rotated by this motor drive force. The side plates 18 are provided on both the left and right sides, and the document feeding paths 18a are formed in a C-shape from the side between the left and right side plates 18. The document placement plate 17 is provided so as to be continuous, and above the paper removal roller mechanism shown in Figs. 1 to 4, and the separation roller of the paper removal roller mechanism downstream of the document placement plate 17. The reduction roller 16 which contacts 12 is provided.

A torque limiter is provided between the reduction roller 16 and the roller shaft 16a, and the roller shaft 16a rotates in the opposite direction to the paper conveyance rotation direction of the reduction roller 16 (i.e., with the conveying drive shaft 1). Rotating in the same direction). When one sheet of paper is introduced between the separation roller 12 and the reduction roller 16, the friction force between the separation roller 12 and the top of the paper and the friction force between the reduction roller 16 and the bottom of the paper interact with each other. The reduction roller 16 rotates in the conveying direction of paper together with the separation roller 12. However, when two or more sheets of paper are introduced between the rollers 12 · 16, the frictional resistance of the papers is smaller than the frictional resistance of each roller 12 · 16 and the paper, so that the separation roller 12 and the upper layer of paper are separated. The interaction force is divided by friction and friction between the reduction roller 16 and the lower layer paper, so that the frictional resistance force acting on the reduction roller 16 is weakened, and the reduction roller 16 reduces the driving force of the roller shaft 16a. And rotates in the reverse direction to the paper conveyance direction. In this way, the overlapped conveyed documents are retracted by the reverse conveyance direction rotation of the reduction roller 16, and the originals are separated one by one and conveyed between the separation roller 12 and the reduction roller 16.

The discharge portion of the original is located below between the document placement tray T and the document placement plate 17, and a discharge roller 25 · 26 is provided in this portion. Moreover, the discharge document placement tray T 'is provided in the downstream of discharge roller 25 * 26. At the lower end of the document feeding path 18a, a transparent document reading surface 27 is installed, and a reading image of the document is projected by a reading device installed directly below it. Then, the document feed rollers 19, 21, 23, 25 provided in the middle of the document feed path 18a are set to have a higher rotation speed than the separation roller 12. This is for separating the gap of the document fed in a continuous shape, and by separating in this way, the gap of the original is detected by the document feeding sensor 28 provided along the document feeding path 18a.

Since this invention was comprised as mentioned above, the following effects can be acquired. That is, since it is configured as claimed in claim 1, even if a sudden load acts on the roller, the spring-type drive transmission member is changed from its tightened state to its relaxed state and the drive transmission is interrupted, and the force applied to the transmission mechanism is damaged by damage. The roller drive transmission mechanism which does not become possible can be provided. Further, at the time of driving rotation, since the spring which is the drive transmission member is always relaxed, a strong tightening force is applied to prevent the malfunction of the roller caused by the spring being caught between the driving member and the driven member.

Also, as in claim 2, the configuration of claim 1 is applied to a drive transmission mechanism that connects a discharge roller, a separation roller, or the like, so that the spring-type drive transmission member is formed even if the discharge roller contacts the mounting surface of the paper quickly. It is released in the loosening direction to alleviate shock and cut off drive transmission. In this way, the damage of the electric mechanism is solved.

Further, as in claim 3, the present invention can be applied to a document feeder, and can be applied to a document feeder of a device that maintains a structure for feeding a document, such as an image processing apparatus having a function of copying and facsimile. It is possible to apply the document feeding mechanism that solves the damage of the gear mechanism in the absence of an original.

Claims (3)

A drive transmission mechanism of a roller that rotates by obtaining a driving force; A drive transmission mechanism for a roller, characterized in that a spring type drive transmission member is installed between the roller and the drive side to transmit a driving force in a loosening direction in which the spring is released. 2. The roller according to claim 1, wherein the roller is a carrying-out roller for carrying out paper while pressing the uppermost surface of the loaded paper from above, and is connected by an electric mechanism so as to rotate in the same direction as the conveying rotation of the separating roller provided on the downstream side. Roller drive transmission mechanism. The roller drive transmission mechanism according to any one of claims 1 and 2, wherein the drive transmission mechanism of the roller is applied to the document feed mechanism.

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